But speeds in other countries may range from 2G all the way to 4G—that could be the difference between downloading a web page in a few seconds (4G) to downloading a web page in three minutes (2G). depending on how much data you use or how much congestion there is. You can find out what data speeds to expect in AT&T’s comprehensive international coverage chart.

The average smartphone subscriber uses about 6.9 GB of data per month, according to a June 2017 report from information and communications technology group Ericsson (up from 3.7 GB in 2016). This number serves as a good guidepost when you choose a plan: It’s roughly the amount of data you’ll need if you check directions and browse the web daily. But if you’re looking to cover multiple family members, or if you spend many hours per day on your phone, you’ll need a higher-tier unlimited plan. (And if you don’t use your phone even for directions or web browsing? You’re a prime candidate for a much cheaper plan through an MVNO.)
With every carrier, unlimited data isn’t truly unlimited — but AT&T sets the limit unusually low, with every unlimited plan throttling speed after 22 GB of data usage. That’s half of T-Mobile’s data limit. If you spend a lot of time streaming or browsing social media in places without Wi-Fi, there’s a chance you could go over your limit. And if you want “unlimited” data but no DIRECTV Live, no dice: The pair are inseparable. There are some standard phone plans that have smaller data limits for a lower price, but the comparable value is poor. While you can set your cap at 1 GB for just $25, the 10 GB cap is $75 — more expensive than the standard $70 unlimited plan.
Because if you don’t pick the phone wisely and you keep on using unlimited data, you’ll have to pay lots of extra charges for that.The first thing you need to consider when buying a mobile phone is whether it features GSM Band, and if it does, you need to consider at what frequencies does it work. Then with the help of these frequencies, you can check in which countries your phone’ll work.
As pricey as Verizon's Above Unlimited plan may be, it could be worth it if business takes you overseas on a monthly basis, thanks to the addition of some complimentary TravelPasses. For infrequent travelers taking short trips, programs like Verizon’s TravelPass or AT&T’s International Day Pass will likely be good enough. But again, T-Mobile offers the most appealing international coverage, especially once it launches its $5 On Demand Pass in August.
Verizon also offers pay-as-you-go pricing for international travel. You’ll pay 99 cents per minute in Canada and Mexico and $2.99 per minute in other countries for voice service. (Talk rates fall to $1.79 per minute in 140 countries with monthly pricing.) Each text message you send will cost you 50 cents, and each received text will set you back 5 cents. Your data will be charged at a rate of $2.05 per megabyte.

RootMetrics gives out regional awards to carriers that are top performers in categories like network speed and reliability, call quality, and data performance. Verizon swept the table in 2018, earning 112 of 125 possible awards. Sprint, by comparison, earned three awards. What does this mean? Verizon has the best track record for offering its customers a reliable network and satisfying performance.


Sign up for Google's Project Fi, and you need never worry about running out of data when you're overseas. The service costs $20 a month for talk and text, plus $10 for each gigabyte of data you use, with Google now capping monthly bills at $80 even if you need to use more data. Project Fi lets you draw from your regular high-speed data in more than 135 countries with no roaming charges. You just pay the same $10-per-gigabyte rate as before. (You're also credited on your next bill for any data you didn't use.) Unlimited international texting comes with every plan and calls cost just 20 cents a minute. The number of Project Fi-compatible phones is expanding: in addition to Google's Pixel devices, you can now use the Moto X4 and G6 in addition to LG's G7 ThinQ and V35 ThinQ.

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